Telephone-transmitter.



A. G. KAUFMAN L. J. LLPPMANN.

TELEPHONE TBANSHITTEB.

Arrmon'rol funn 11.19, 1901.

, 900,386) A Patented Oct. 6, 1908.

2 SHEETS-SHEET 2.

. l 111,1 -ff' NVENT ns i BY w A TUHNE YS 1 fro-au whoma-fwiay mm..-

UNITED sTATEsSPArEST OFFICE.

'lf'fB'e'it lnownfftha't"'we,-'Ano1.rrr G. KAUF- Mnr an LEOPOLD J. LlrrMArr-N, `both* citi-v ensfdfjt eUnited'States, and residents of tlidborou h' Statie-Tof@ lew 'York, have jointly invented ,"crtainnw and Vuseful Improvements in nitefd "19053;

"I'l'elelihoue'f-v Transmitters, of which the fol-4 lowing' `is a specification.

Our invention relates to electric -t-elcphones, and

particularly "to the transmitters thereof, and 1 as for its object to so improve 4the uconet'rucrti'on 'and arrangement 'of the transmitter aste secure a veryjgreat eii# cienc'y, and also=toenablea plurality of re-y ceivers to receive'sound waves eiciently at "the 'same time-"from one speaker. 1 The features' of construction and" arrangement j constituting our invention will be "fully 'described hereinafter, and particularly poiniedont-'inthe appended'cluims.

' i" Reference is to be 'had to the accompany- 'ini' drawings, in' which l rgure`11savert1cal section taken o n line 11i-1- of F ig. 2,'fshowing agroup of transmitters arranged according to our invention; Fig. 2isafro1i`t View of the same arrangernen't, With'p'arts-'broken away; Fig. 3" is a" cross-section of one ofthe transmitters; Fig.

' 4lfi`s 'a' partial 'face'view 'ool'ie-of'the trans- 'initters, 'with al portion of the diaphragm broken away inorder'to disclosethe parts lying' behind itg'Fig. 5 is-a detail. rear View ofthe transmitter in its carrier; Fig. G a Q''usseotzon' ofja somewhat differentlform of transmitter,'and li-i'gf is a partial'facc View of the transmitter shown in "Fig 6, the' diaphragm Vbeing removed.

.Most of the features-oit" the transmitter shown herein are reproduced lfrom the illus- 4 tration'contained'inour application for a tnt, 4Serial*Nm 343,198, filed by usin the States Patent' Oiliccon lNovember 13,

u Upon a suitable base or board A, lwhich is 'seci'l'rcd to the'L Wall-'plate B; and which. is

"provided with anuinber of "sockets (five as shown), are, set 'thimble's 5C, preferabl each l"provided withl a lining C4 toji'n'su :ite it wofeachthimbleis located a sound-receiving D,` f p the oentraltrurnpet ltsneiglibors by such ridges. As shown 1n 110 of -Manhatta-n, ci ty, county,4 and l teners for the carbon disk F2.

casing arranged a carbon, body or carrierl se tiredness, Yeas; N.' Y., eSeifer-oas AMnBIoANjQALLArr/IONE-COMPANY, or NEW Youn, N.' Y.; A CORPORATION4 or V- D being' stra-iht, while vthe lateral'trumpets AAD. are curve which thel said sound-receiving tubes .confverg, We' locate a guide' K -forpositionin'o' the operators mouth, so that the sound Patented'oet. e, ieee. l

so that' they will converge f forwardly. Adjacent to the point toward waves Will produce the maximum efect.

-' I`his (annular) guide K is preferably adjustable, being for this purpose carried by a rod K mounted to slide in a sleeve K2 and secured in position after adjustment'by a Set I'screw Ks. We have found that with different persons the distance at which thegring K `should be from the. sound-receivinfg. tubes D, D', in order to secure the best results, is -not the same, hence we haveV made 'provision for adjusting seid ring 'as described. In order to better concentrate thesound waves,

We may employ a sound shield orcurtain L` which should be extensible when the ring K is adjustable as described. f

The transmitters pro er are contained..

within thethiinbles C an each of themvcomprises a casing E pressed forward by a spuug GB engaging a contact point Gr9 -on t 1 e Wall-plate B, and also steadiedin .the

thimble 1f desired by a circumferential A spring, E. shown in-Figs. l and 5. This casing E may be of the concave shape shown in v Figs. 13 and 5. f

At the forward end of the casing E isrlo- -cated-ia clamping rinf- F which holds'the diaphragm F, preferably made of aluminum.V

The rfliaphragm is first placedin the ring,

and. ti 'in the projecting end of the ring 1s bent inward to the position shown in Fig-3, in which it clumps the dia hragm, Against the inner surface of the iaphragm We 'secure a carbon disk F. .'From the inner-:surface of this disk we project contact anda itatiugunenlbers F3 which in the particu' ar :form shown vare ball-shaped and are secured by -shanks Fi forming at the same time fas- Within the 'G ofcircular shape having pockets Gf vilrgits this arrangement of pockets, the forward "face of the carrierorblock G has a series of connected edges or ridges lying in the sameV plane, each pocket being thus separated from carbon' block secure to the stem G'fa sprin Fig. 3, the contact' members F' are arranged in re 'stry -with the pockets G'. The carbon b ock is secured to the casingE by means of a screw G2 and a metal stem G which is Ainsulated by means of a sleeve. G" and held in position b means of a collar G and set.

screw G". he 4block Gr ispreferably surroundedby'- one'or morerings Hmade of niica' and secured byy wire wrapping H.

This mica rin projects lin advance .of the and is surrounded atits forward rtion b ya ring vI of felt, cotton batting. o other 'yielding material against which 'lies a nietal rin I .pressed forward, that is toward the diap ra in, by a coiled s pring'I. The carbon disk 2 is received within the ring -Ii The chamber formed between the front face of therblock G, the rear face of the diaphragm and the rings H, I, is filled with granulated carbon' J. A screw Gfserves to ada iil'toy engage afcontact point G -secured to t e -wall-p ate B and connected with one of the crcuit'wires, as shown in 1.' The I* -V 'second connection is made by means of a s rin tongue C rejected from the thimble (Fang [and the stein G.

engaging t e .other contact member or terminal C* -secured to the wall`- plate 1. B.

One-*connection therefore -runs to: the dia- VT e y function of t e mica ring is primarily.

to provide a. non-conductin later support for the granulirjcarbon so t at the same ma not force-itself into' the interstices of the fe t l and thus byits absence loosen the main body un sin .dricalj form. The carbon block g, which may '.7 differs slightly frm emi demi 'erivet of the carbon remainin in place. Its fur? ther function is-to provi e a rfectly smooth contact with the ring of fe t so tlfiat'there will be as little opportunity for the productionof friction as p ssible, diu'i the diierential movement tween the fe t ring and the diaphragm on the che hand and the mica rinland the conducting carrier on the other.

e construction llustratedby Fi 6 and -above.

ve made of substantially 1in- The vdiaphragm f is held in a clam 4j"-v'v li ilch also receives the forwa beofE the same character as the one first del scribed, isfastened in position bymeans of f converging pockets and to a spring member g" having 'a ten -en'cy'to' throw thecarbon block forward,

thatistoward'the diep The blockI is shown surrounded by a'ring i. of feltor 'contact spring g" which is adapted to G which is g', to a metal pl" other iei .mariti-'ind i m11 a.' .is-dis y' dliiigfront of the ringe'. "Theydligmber orirnedA between the blockv g, th'ediap1' fand thei'ingtfisilled with grana carbon j. Ascrew'gservefstoeecure .the spr plate g4 to an member g' and so serves to connect'ffsaidfspriug plate with a conducting member g' having another .fastening "screw g, and with tlie ngt the terminal orcontact member G? upon t e wall-plate B. A

We have found by actual tests that transmitters of the kind above described-'ere exceedingly 'sensitive and the particular ar- .ranlgement of aV set of transmitters, shown in igs. 1 and 2, is nseful'when it is desired to havev a message transmitted simultaneously toV different places or rooms at which the respective receivers are located.

We claim:v

1. Atele hone transmitter comprising a casing, a. ia hragm, a conducting carrier facing the `aphragm, loose conducting material between the carrier and the diaphragm, and ball-sha contact members proJecting teri'al.y

2. 'A telephone transmitter comprising a casing, a diaphra a dat carbon disk on the vinner face-.o the diaphragm'clamped thereto lby projecting contact" members, a

conducting carrier facing said disk and loose conducting material between the disk and the carrier, the saidcontact members. ro-

into said conducting ma.l

jecting into the loose l.conducting material va suilicient distance to enable them to act-'aseilicient a tutors-'thereof 3. A te eplione transmitter comprising a casing, a diap a atcarbon disk on the inner face of e diaphragm, a conducting carrier facing said disk, loose conducting material between the disk and thecar'rier .and separate .spaced contact members.

ducting material..

4. A vtelephone transmitter compri a casing, a' diaphragm a dat carbon vdisk 0n the inner face of.. e ingcarrier facing said-disk, conducting material between the disk'and the carrier and ba11-sha contact members ,from saidl into the loose 'een acting material.

5.A' telephone transmitter a thimble rovided with a sound receivi 'i tube, adiaphragm hol member into said tblmbleilnd' a member towardsaid 7: fait of iephmie hip..

proi jecting from said. disk into the diaphragm, a conductizo vne

nocivi said trumpets convergin i forw y, an a guide separate fromv sai trum vand located inadvance thereof, for

. theo rators mouth adjacent to ver combination, -of .a set of 'telephone transmitters provided with vinde ndent convergent soun tubs't e mouths of .which areinelmed toward oneanother, and a4 ide for positioning the operators mouth acent tothe point toward which said 'tu converge, said guide being adjustable toward and ,omsai tubes. j 9. The combination ,of a set otele hone transmitters' provided with paralle diaph'ragms and independent convergent soundcollecting trumpets the mouths vof which are inclined .toward one another, and an annul'ar guide, parallel with the said diaand located in front of said trum' .for positioning the operators mouth adjacent to the pjomt toward which said trumpets converge.

ent convergent sound-collecting trumpets the, mouths of which are inclined toward one another anda perforated ide extending perpendicular 'to the axis o the cone of convergence, for positioning the op- -erators mouth adjacent to the 4apex of said cone. l

. l11. The combination of aset of telephone il transmitters provided with conicallyV indedent'convergent sound-collecting tubes i .mouths of which are inclined toward one another and a perform y dicular to the axis of the cone of ff'iconvergence, 'for positioning the operatorsv mouth adjacent -to the `'apex of said cone, "[said g|1ide being adjustable-relatively to said tubes in a direction parallel with the cones 4l '19." The combination of aset of telephone transmitters provided 'with convergent soundreceivi tubes,- a'guide for theoper-` ators mouth ocated adjacent tothe point toward whic said tubes converge, 4and a l sound-shield or curtainextending from said 'de toward the tubes and surrounding the 6I cond-receiving ators mouth, ocated point towa ywhich. the trumpets con- I0. The combmation'of a set of telephone transmitters provided with conically `indeL toward which said tubes converge, said guide being ad'ustable toward an' from said tubes, an an extensible sound-shield or curtain extending from said guide toward -the tubes and surrounding the latter.

. 14. A telephone transmitter comprising a. stationary member` provided with,a soundi receiving tube, a diaphragm-holding mem- `ber adjacent to said stationary member, and` a spring for pressing the two -members tofgether.

15. A tele hone transmitter comprising a 'casin an a uminum diaphra m, a fiat carphragm, and loose conducting material between the carrier and the diaphragm. `17. A telephone transmitter comprising a casing, a vibrating diaphragm, a' conducting -carrier located within the casing a mica 8 sleeve projecting in advance. of sald carrier, but maintainedout of contact with the diaphragm, retainlng in positlon a ybodyA of oose conducting materlal between the carrier-and diaphragm and an annular mem- 9 ber'outside o the mica sleeve for preventln 'the esca-pe of the loose conducting materia between-th diaphragm and the mica sleeve. 18. A te ephone transmitter comprising a casing, a vibrating1 diaphragm, a 'conducting 9 carrier within t e casing, an insulating sleeve surrounding said carrier and projectv ing in advancel thereof but maintained out. of contact with .the diaphragm, a ring of soft yielding material surrounding said sleeve, a 1 pring for pressing-said ring against the' iaphragm, and loose conducting material between the carrier and the diaphragm.

In testimony whereof, we have signed our names to this specification in" the presence 1 of two subscribing'witnesses.

ADOLPH G. KAUFMAN, LEOPOLD J. LIPPMANN.

Witnesses:

O'i'ro v. SCH-ENR, JOHN Lorna. f 

